Reduced strain rate sensitivity by structural rejuvenation in metallic glass under nanoindentation

Through tailoring the energy state of a Zr-based metallic glass (MG) by constrained compression, we revealed that the strain rate sensitivity of MGs strongly depends on the energy state. For the as-cast MG with low energy state, hardness increases with the increasing strain rate, showing a positive m value of 0.0132. However, the hardness is independent on the strain rate in the highly rejuvenated MG with a high energy state. These observations can be well understood from free volume model. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

Tailoring the energy state of a Zr-based metallic glass (MG) through constrained compression reveals a strong dependence of MG strain rate sensitivity on energy state. The hardness of as-cast MG increases with strain rate, while no dependence is observed in highly rejuvenated MG. These observations can be well understood through the free volume model.